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For a given kinetic energy, which of the...

For a given kinetic energy, which of the following has the smallest de Broglie wavelength : electron, proton and `alpha-particle`?

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The correct Answer is:
A
Wavelength of the de Broglie wave associated with a particle is inversely proporinal to the mass of the particle. Since the mass of electron is less than that of proton , therefore wavelength of the de Broglie waves associated with electron would be more
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